Green’s Dictionary of Slang

1. a seat.

1883		J. Keane On Blue Water 207: [of a bunk] ‘Did you look in his pew?’ said I, as I stepped across the forecastle and looked in his bunk.
1904		C. Connors Bowery Life [ebook] Dere I sat, like er mug wot had got in de wrong pew an’ wuzn't wise ter wot wuz comin’ off de next move .
1930		E. Waugh Vile Bodies 191: Always a pew and a drink for old friends.
1950		R. Starnes Another Mug for the Bier 25: I took a quick look at the taxpayers’ pews.
1970		J. Conaway Big Easy 27: Make it, Fats. That pew’s took.

2. (US Und.) the electric chair.

1939

Howsley Argot: Dict. of Und. Sl.